tree 8b26267365d9aa2fb599725d70108375257179c3
parent f66c734d3c056b6b391f8f8487a7d81c1d55b87f
author Nick Vatamaniuc <vatamane@apache.org> 1536269494 -0400
committer Nick Vatamaniuc <nickva@users.noreply.github.com> 1536272860 -0400

Allow disabling off-heap messages

Off-heap messages is an Erlang 19 feature:

http://erlang.org/doc/man/erlang.html#process_flag_message_queue_data

It is adviseable to use that setting for processes which expect to receive a
lot of messages. CouchDB sets it for couch_server, couch_log_server and bunch
of others as well.

In some cases the off-heap behavior could alter the timing of message receives
and expose subtle bugs that have been lurking in the code for years. Or could
slightly reduce performance, so a safety measure allow disabling it.